check_installed: Check if packages are installed

In DesiQuintans/librarian: Install, Update, Load Packages from CRAN, 'GitHub', and 'Bioconductor' in One Step

Description

Check if packages are installed

Usage

check_installed(...)

Arguments

...	(Dots) Package names as bare names, strings, or a character vector. If left empty, lists all installed packages.

Value

If dots is empty, a character vector of all installed packages. Otherwise, return a named logical vector where TRUE means the package is installed.

Examples

## Not run: 
check_installed()

#>   [1] "addinslist"  "antiword" " ape"  "assertthat"  ...

check_installed(c("utils", "stats"))

#> utils stats 
#> TRUE  TRUE 

check_installed("datasets", "base", fakepkg)

#> datasets     base  fakepkg 
#>     TRUE     TRUE    FALSE 

## End(Not run)

DesiQuintans/librarian documentation built on July 16, 2021, 2:25 a.m.